PatellaKnee JointCartilage, ArticularOsteoarthritis, KneeCartilageKneeCartilage DiseasesPainArthralgiaArthroplasty, Replacement, KneeKnee InjuriesQuadriceps MuscleMagnetic Resonance ImagingTibiaKnee ProsthesisChondromalacia PatellaeFemurPatellofemoral JointPain MeasurementPatellar LigamentOsteoarthritisPain ManagementRange of Motion, ArticularChondrocytesPatellar DislocationChronic PainMenisci, TibialBiomechanical PhenomenaPatellofemoral Pain SyndromePain, PostoperativeJoint InstabilityNasal CartilagesWeight-BearingArthroscopyCross-Sectional StudiesJoint DiseasesCartilage Oligomeric Matrix ProteinAnterior Cruciate LigamentEar CartilageHyaline CartilageProteoglycansLaryngeal CartilagesPain ThresholdPopliteal CystExerciseOsteochondritisBody Mass IndexMatrilin ProteinsNail-Patella SyndromeLow Back PainBack PainPain, ReferredDislocationsBone MalalignmentFractures, CartilageTreatment OutcomeSeverity of Illness IndexKnee DislocationCollagen Type IINeck PainAbdominal PainPain, IntractableAggrecansMusculoskeletal PainGlycosaminoglycansExtracellular Matrix ProteinsFollow-Up StudiesPain PerceptionPelvic PainChondrogenesisTendonsSynovitisLigaments, ArticularStifleProchloronOsteochondrosisOsteophyteFacial PainProspective StudiesRecovery of FunctionBone and BonesGrowth PlateAcute PainCadaverPosterior Cruciate LigamentCollagenStress, MechanicalTendinopathyShoesSynovial MembraneDisability EvaluationBursitisMuscle StrengthBracesBone Marrow DiseasesOrthopedic ProceduresEpiphysesArthrographyTime FactorsGait